Shims For Lengthening | McMaster-Carr

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Corrosion Resistant

Won't rust in wet and outdoor environments

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Won't degrade when exposed to most chemicals

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Hold their shape under heavy loads

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Keep multiple thicknesses on hand so you always have the right one

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Shims for Lengthening Screw Shoulders

Image of ProductInUse. Front orientation. Contains Annotated. Shims. Round, Sold Individually, Shoulder Lengthening.

When shoulders come up short, use these shims to extend the shoulder length on your screw. Wiggle the shims over the threads and up to the existing shoulder to create the exact shoulder length you need. Use them to create more space for bearings, pulleys, and sprockets, or extend the length of travel along the shoulder.

You can stack multiple shims to achieve the exact shoulder length or space you need.

18-8 Stainless Steel—The choice for wet and outdoor environments, these shims resist rust. However, they’ll corrode or pit when exposed to salt water and chemicals.

Super-Corrosion-Resistant 316 Stainless Steel—Superior to 18-8 stainless steel, these shims won't degrade when exposed to harsh weather, salt water, and most chemicals.

Stress-Resistant Spring Steel—These shims are harder and hold their shape better than carbon steel. Use them for high-stress applications, such as leveling heavy machinery. They're best for dry environments since moisture will cause them to rust.

	Thk.	Thk. Tolerance	For Screw Size	ID	ID Tolerance	OD	OD Tolerance	Min. Hardness	Pkg. Qty.		Pkg.
18-8 Stainless Steel





				For 3/16" Diameter Shoulder
				0.005"	-0.0005" to 0.0005"	No. 8	0.146"	0" to 0.011"	0.178"	-0.002" to 0.002"	Rockwell B70	10	90135A432	000000



						For 1/4" Diameter Shoulder
						0.005"	-0.0005" to 0.0005"	No. 10	0.171"	0" to 0.011"	0.241"	-0.002" to 0.002"	Rockwell B70	50	90135A431	00000
						0.016"	-0.002" to 0.002"	No. 10	0.171"	0" to 0.011"	0.241"	-0.002" to 0.002"	Rockwell B70	50	90135A443	00000
						0.03"	-0.003" to 0.003"	No. 10	0.171"	0" to 0.011"	0.241"	-0.002" to 0.002"	Rockwell B70	25	90135A455	0000



								For 5/16" Diameter Shoulder
								0.005"	-0.0005" to 0.0005"	1/4"	0.234"	0" to 0.011"	0.303"	-0.002" to 0.002"	Rockwell B70	50	90135A433	00000
								0.016"	-0.002" to 0.002"	1/4"	0.234"	0" to 0.011"	0.303"	-0.002" to 0.002"	Rockwell B70	25	90135A445	0000
								0.03"	-0.003" to 0.003"	1/4"	0.234"	0" to 0.011"	0.303"	-0.002" to 0.002"	Rockwell B70	25	90135A457	0000



										For 3/8" Diameter Shoulder
										0.005"	-0.0005" to 0.0005"	5/16"	0.289"	0" to 0.011"	0.365"	-0.002" to 0.002"	Rockwell B70	50	90135A435	00000
										0.016"	-0.002" to 0.002"	5/16"	0.289"	0" to 0.011"	0.365"	-0.002" to 0.002"	Rockwell B70	25	90135A447	00000
										0.03"	-0.003" to 0.003"	5/16"	0.289"	0" to 0.011"	0.365"	-0.002" to 0.002"	Rockwell B70	25	90135A459	00000



												For 1/2" Diameter Shoulder
												0.005"	-0.0005" to 0.0005"	3/8"	0.352"	0" to 0.011"	0.491"	-0.002" to 0.002"	Rockwell B70	25	90135A437	00000
												0.016"	-0.002" to 0.002"	3/8"	0.352"	0" to 0.011"	0.491"	-0.002" to 0.002"	Rockwell B70	25	90135A449	00000
												0.03"	-0.003" to 0.003"	3/8"	0.352"	0" to 0.011"	0.491"	-0.002" to 0.002"	Rockwell B70	25	90135A461	00000



														For 5/8" Diameter Shoulder
														0.016"	-0.002" to 0.002"	1/2"	0.473"	0" to 0.011"	0.616"	-0.002" to 0.002"	Rockwell B70	25	90135A451	00000
														0.03"	-0.003" to 0.003"	1/2"	0.473"	0" to 0.011"	0.616"	-0.002" to 0.002"	Rockwell B70	10	90135A463	0000



																For 6 mm Diameter Shoulder
																0.005"	-0.0005" to 0.0005"	M5	4.95 mm	0 mm to 0.25 mm	5.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A221	00000
																0.01"	-0.001" to 0.001"	M5	4.95 mm	0 mm to 0.25 mm	5.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A228	00000
																0.015"	-0.001" to 0.001"	M5	4.95 mm	0 mm to 0.25 mm	5.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A236	00000



																		For 8 mm Diameter Shoulder
																		0.005"	-0.0005" to 0.0005"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A304	00000
																		0.01"	-0.001" to 0.001"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A312	00000
																		0.015"	-0.001" to 0.001"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A318	00000
																		0.02"	-0.0015" to 0.0015"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A326	00000
																		0.025"	-0.0015" to 0.0015"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A331	00000
																		0.031"	-0.002" to 0.002"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A337	00000



																				For 10 mm Diameter Shoulder
																				0.005"	-0.0005" to 0.0005"	M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A416	00000
																				0.01"	-0.001" to 0.001"	M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A424	00000
0.015"																				-0.001" to 0.001"	M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A433	00000
0.02"	-0.0015" to 0.0015"																			M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A439	00000
0.025"	-0.0015" to 0.0015"																			M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A444	00000
0.031"	-0.002" to 0.002"	M8																		7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A450	00000



		For 12 mm Diameter Shoulder
		0.005"	-0.0005" to 0.0005"																	M10	9.7 mm	0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A508	00000
		0.01"	-0.001" to 0.001"	M10																9.7 mm	0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A511	00000
		0.015"	-0.001" to 0.001"	M10	9.7 mm															0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A517	00000
		0.02"	-0.0015" to 0.0015"	M10	9.7 mm															0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A522	00000
		0.025"	-0.0015" to 0.0015"	M10	9.7 mm															0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A526	00000
		0.031"	-0.002" to 0.002"	M10	9.7 mm															0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A532	00000



				For 16 mm Diameter Shoulder
				0.005"	-0.0005" to 0.0005"	M12	11.65 mm													0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A610	00000
				0.01"	-0.001" to 0.001"	M12	11.65 mm													0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A618	00000
				0.015"	-0.001" to 0.001"	M12	11.65 mm													0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A623	00000
				0.02"	-0.0015" to 0.0015"	M12	11.65 mm													0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A628	00000
				0.025"	-0.0015" to 0.0015"	M12	11.65 mm													0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell C40	5	91437A634	0000
				0.031"	-0.002" to 0.002"	M12	11.65 mm													0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell C40	5	91437A640	00000



						For 20 mm Diameter Shoulder
						0.005"	-0.0005" to 0.0005"	M16	15.5 mm											0 mm to 0.25 mm	19.93 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A701	00000
						0.01"	-0.001" to 0.001"	M16	15.5 mm											0 mm to 0.25 mm	19.93 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A712	00000
						0.015"	-0.001" to 0.001"	M16	15.5 mm											0 mm to 0.25 mm	19.93 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A717	00000
						0.02"	-0.0015" to 0.0015"	M16	15.5 mm											0 mm to 0.25 mm	19.93 mm	-0.25 mm to 0 mm	Rockwell C40	10	91437A725	00000
						0.025"	-0.0015" to 0.0015"	M16	15.5 mm	0 mm to 0.25 mm										19.93 mm	-0.25 mm to 0 mm	Rockwell C40	5	91437A734	00000
						0.031"	-0.002" to 0.002"	M16	15.5 mm	0 mm to 0.25 mm	19.93 mm									-0.25 mm to 0 mm	Rockwell C40	5	91437A738	00000

						Super-Corrosion-Resistant 316 Stainless Steel





										For 3/16" Diameter Shoulder
										0.005"	-0.0005" to 0.0005"	No. 8	0.146"							0" to 0.011"	0.178"	-0.002" to 0.002"	Rockwell B70	10	91017A452	00000



												For 1/4" Diameter Shoulder
												0.005"	-0.0005" to 0.0005"							No. 10	0.171"	0" to 0.011"	0.241"	-0.002" to 0.002"	Rockwell B70	10	91017A456	00000
												0.016"	-0.002" to 0.002"	No. 10						0.171"	0" to 0.011"	0.241"	-0.002" to 0.002"	Rockwell B70	10	91017A556	00000
												0.03"	-0.003" to 0.003"	No. 10	0.171"					0" to 0.011"	0.241"	-0.002" to 0.002"	Rockwell B70	10	91017A656	00000



														For 5/16" Diameter Shoulder
														0.005"	-0.0005" to 0.0005"					1/4"	0.234"	0" to 0.011"	0.303"	-0.002" to 0.002"	Rockwell B70	10	91017A464	00000
														0.016"	-0.002" to 0.002"					1/4"	0.234"	0" to 0.011"	0.303"	-0.002" to 0.002"	Rockwell B70	10	91017A564	00000
														0.03"	-0.003" to 0.003"	1/4"				0.234"	0" to 0.011"	0.303"	-0.002" to 0.002"	Rockwell B70	10	91017A664	00000



																For 3/8" Diameter Shoulder
																0.005"	-0.0005" to 0.0005"			5/16"	0.289"	0" to 0.011"	0.365"	-0.002" to 0.002"	Rockwell B70	10	91017A469	00000
																0.016"	-0.002" to 0.002"			5/16"	0.289"	0" to 0.011"	0.365"	-0.002" to 0.002"	Rockwell B70	10	91017A569	00000
																0.03"	-0.003" to 0.003"			5/16"	0.289"	0" to 0.011"	0.365"	-0.002" to 0.002"	Rockwell B70	10	91017A669	00000



																		For 1/2" Diameter Shoulder
																		0.005"	-0.0005" to 0.0005"	3/8"	0.352"	0" to 0.011"	0.491"	-0.002" to 0.002"	Rockwell B70	10	91017A475	00000
0.016"																		-0.002" to 0.002"	3/8"	0.352"	0" to 0.011"	0.491"	-0.002" to 0.002"	Rockwell B70	10	91017A575	00000
0.03"	-0.003" to 0.003"																	3/8"	0.352"	0" to 0.011"	0.491"	-0.002" to 0.002"	Rockwell B70	10	91017A675	00000



																		For 6 mm Diameter Shoulder
																		0.005"	-0.0005" to 0.0005"	M5	4.95 mm	0 mm to 0.25 mm	5.96 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A110	00000
																		0.015"	-0.001" to 0.001"	M5	4.95 mm	0 mm to 0.25 mm	5.96 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A170	00000



			For 8 mm Diameter Shoulder
			0.005"																-0.0005" to 0.0005"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A120	00000
			0.015"																-0.001" to 0.001"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A180	00000
			0.031"																-0.002" to 0.002"	M6	5.92 mm	0 mm to 0.25 mm	7.95 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A240	00000



																				For 10 mm Diameter Shoulder
																				0.005"	-0.0005" to 0.0005"	M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A130	00000
																				0.015"	-0.001" to 0.001"	M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A190	00000
				0.031"																-0.002" to 0.002"	M8	7.82 mm	0 mm to 0.25 mm	9.95 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A250	00000



																				For 12 mm Diameter Shoulder
																				0.015"	-0.001" to 0.001"	M10	9.7 mm	0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A210	00000
																				0.031"	-0.002" to 0.002"	M10	9.7 mm	0 mm to 0.25 mm	11.96 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A260	00000



																						For 16 mm Diameter Shoulder
						0.005"																-0.0005" to 0.0005"	M12	11.65 mm	0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A150	00000
						0.031"	-0.002" to 0.002"															M12	11.65 mm	0 mm to 0.25 mm	15.5 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A270	00000



								For 20 mm Diameter Shoulder
								0.031"	-0.002" to 0.002"													M16	15.5 mm	0 mm to 0.25 mm	19.93 mm	-0.25 mm to 0 mm	Rockwell B70	10	94141A280	00000

								Stress-Resistant Spring Steel





																						For 3/16" Diameter Shoulder
																						0.005"	-0.0005" to 0.0005"	No. 8	0.146"	0" to 0.011"	0.185"	-0.002" to 0.002"	Rockwell C40	10	91140A232	00000



																						For 1/4" Diameter Shoulder
																						0.005"	-0.0005" to 0.0005"	No. 10	0.171"	0" to 0.011"	0.248"	-0.002" to 0.002"	Rockwell C40	25	91140A231	00000
																						0.015"	-0.00075" to 0.00075"	No. 10	0.171"	0" to 0.011"	0.248"	-0.002" to 0.002"	Rockwell C40	50	91140A243	00000
																						0.032"	-0.0015" to 0.0015"	No. 10	0.187"	0" to 0.011"	0.248"	-0.002" to 0.002"	Rockwell C40	25	91140A255	00000



																						For 5/16" Diameter Shoulder
																						0.005"	-0.0005" to 0.0005"	1/4"	0.234"	0" to 0.011"	0.308"	-0.002" to 0.002"	Rockwell C40	25	91140A233	00000
																						0.015"	-0.00075" to 0.00075"	1/4"	0.234"	0" to 0.011"	0.308"	-0.002" to 0.002"	Rockwell C40	50	91140A245	00000
																						0.032"	-0.0015" to 0.0015"	1/4"	0.234"	0" to 0.011"	0.308"	-0.002" to 0.002"	Rockwell C40	25	91140A257	00000



																						For 3/8" Diameter Shoulder
																						0.005"	-0.0005" to 0.0005"	5/16"	0.289"	0" to 0.011"	0.371"	-0.002" to 0.002"	Rockwell C40	25	91140A235	00000
0.015"																						-0.00075" to 0.00075"	5/16"	0.289"	0" to 0.011"	0.371"	-0.002" to 0.002"	Rockwell C40	25	91140A247	00000
0.032"	-0.0015" to 0.0015"																					5/16"	0.296"	0" to 0.011"	0.371"	-0.002" to 0.002"	Rockwell C40	25	91140A259	00000



																						For 1/2" Diameter Shoulder
																						0.005"	-0.0005" to 0.0005"	3/8"	0.352"	0" to 0.011"	0.496"	-0.002" to 0.002"	Rockwell C40	25	91140A237	00000
		0.015"																				-0.00075" to 0.00075"	3/8"	0.352"	0" to 0.011"	0.496"	-0.002" to 0.002"	Rockwell C40	25	91140A249	00000
		0.032"																				-0.0015" to 0.0015"	3/8"	0.352"	0" to 0.011"	0.496"	-0.002" to 0.002"	Rockwell C40	25	91140A261	00000



																						For 5/8" Diameter Shoulder
			0.005"																			-0.0005" to 0.0005"	1/2"	0.473"	0" to 0.011"	0.621"	-0.002" to 0.002"	Rockwell C40	25	91140A239	00000
			0.015"																			-0.00075" to 0.00075"	1/2"	0.473"	0" to 0.011"	0.621"	-0.002" to 0.002"	Rockwell C40	25	91140A251	00000
			0.032"																			-0.0015" to 0.0015"	1/2"	0.473"	0" to 0.011"	0.621"	-0.002" to 0.002"	Rockwell C40	25	91140A264	00000



																						For 3/4" Diameter Shoulder
				0.005"																		-0.0005" to 0.0005"	5/8"	0.598"	0" to 0.011"	0.746"	-0.002" to 0.002"	Rockwell C40	25	91140A241	00000
				0.015"	-0.00075" to 0.00075"																	5/8"	0.598"	0" to 0.011"	0.746"	-0.002" to 0.002"	Rockwell C40	25	91140A253	00000
				0.032"	-0.0015" to 0.0015"																	5/8"	0.598"	0" to 0.011"	0.746"	-0.002" to 0.002"	Rockwell C40	25	91140A266	00000



																						For 5 mm Diameter Shoulder
																				0.005"		-0.0005" to 0.0005"	M4	3.98 mm	0 mm to 0.254 mm	5 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A121	00000
																				0.015"	-0.001" to 0.001"	M4	3.98 mm	0 mm to 0.254 mm	5 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A125	00000



						For 6 mm Diameter Shoulder
						0.005"																-0.0005" to 0.0005"	M5	4.976 mm	0 mm to 0.254 mm	6 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A129	00000
						0.015"	-0.001" to 0.001"															M5	4.976 mm	0 mm to 0.254 mm	6 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A133	00000



																						For 8 mm Diameter Shoulder
								0.005"														-0.0005" to 0.0005"	M6	5.852 mm	0 mm to 0.254 mm	8 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A137	0000
								0.015"	-0.001" to 0.001"													M6	5.852 mm	0 mm to 0.254 mm	8 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A142	0000
								0.031"	-0.002" to 0.002"													M6	5.852 mm	0 mm to 0.254 mm	8 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A146	0000



										For 10 mm Diameter Shoulder
										0.005"	-0.0005" to 0.0005"											M8	7.688 mm	0 mm to 0.254 mm	10 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A150	0000
										0.015"	-0.001" to 0.001"											M8	7.688 mm	0 mm to 0.254 mm	10 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A154	0000
										0.031"	-0.002" to 0.002"	M8										7.688 mm	0 mm to 0.254 mm	10 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A158	0000



												For 12 mm Diameter Shoulder
												0.005"	-0.0005" to 0.0005"									M10	9.522 mm	0 mm to 0.254 mm	12 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A161	0000
												0.015"	-0.001" to 0.001"									M10	9.522 mm	0 mm to 0.254 mm	12 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A164	0000
												0.031"	-0.002" to 0.002"									M10	9.522 mm	0 mm to 0.254 mm	12 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A167	0000



														For 16 mm Diameter Shoulder
														0.015"	-0.001" to 0.001"							M12	11.355 mm	0 mm to 0.254 mm	16 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A172	0000
														0.031"	-0.002" to 0.002"							M12	11.355 mm	0 mm to 0.254 mm	16 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A175	0000



																For 20 mm Diameter Shoulder
																0.031"	-0.002" to 0.002"					M16	15.19 mm	0 mm to 0.254 mm	20 mm	-0.254 mm to 0 mm	Rockwell C40	5	92927A179	0000

Shim Assortments for Lengthening Screw Shoulders

Image of Product. Front orientation. Shims. Round, Sold as Assortments, Shoulder Lengthening.

Customize your shoulder lengths by keeping multiple shoulder-lengthening shim sizes on hand. When shoulders come up short, use these shims to extend the shoulder length on your screw. Wiggle the shims over the threads and up to the existing shoulder to create the exact shoulder length you need. Use them to create more space for bearings, pulleys, and sprockets, or extend the length of travel along the shoulder.

You can stack multiple shims to achieve the exact shoulder length or space you need.

Plastic Box—Labels in the lid make it easy to quickly find the right size.

	For Shoulder Dia.	Thicknesses Included	Container Type		Each
Stress-Resistant Spring Steel


	270	1/4", 5/16", 3/8", 1/2", 5/8", 3/4"	0.005", 0.015", 0.032"	Plastic Box	91140A800	0000000
	300	1/4", 5/16", 3/8", 1/2", 5/8", 3/4"	0.015"	Plastic Box	91140A600	000000